Is it me? Kinda long sorry

My boyfriend of 7years has been less sexual with me lately and the other day when i attempted to start somethinghe said he would try ... when i asked what he ment by try he told me he hasnt been getting erections like he use to no morning wood or anything.. i was noticing he wasnt hard when i woke up but i just assumed he had been awake longer so it went away ... we both are very sexualand dont usually have any problems but now since he started having this problem when he doesget an erection hes done a little fast he has always beenthe type to make sure.i was done first usually many times ... so now he wont even let me try to turn him on ... im worried about his health and i feel rejected this morning i tried to dress sexy for him and set the mood before he got home from work but then i got scared he would reject me so i changed before he got home now im just sad and don't know what to do .... i know he isn't cheating....